5.2.2.2.3 2nd point

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "rlc_rx_um_entity_c.h": "c"
+    }
+}

lib/rlc/CMakeLists.txt

@@ -27,6 +27,8 @@ set(SOURCES
   rlc_rx_am_entity.cpp
   rlc_rx_tm_entity.cpp
   rlc_rx_um_entity.cpp
+  rlc_rx_um_entity_c.c
+  rlc_rx_um_entity_c_wrapper.cpp
 )
 
 add_library(srsran_rlc STATIC ${SOURCES})

lib/rlc/rlc_rx_um_entity_c.c

@@ -0,0 +1,21 @@
+#include "rlc_rx_um_entity_c.h"
+
+void handle_um_pdu_outside_reassembly_window(rlc_rx_um_entity_t *entity, UMD_PDU *pdu)
+{
+    entity->RX_Next_Highest = pdu->SN + 1;
+
+    for (uint16_t i = 0; i < UM_WINDOW_SIZE; i++) {
+        if (i < entity->RX_Next_Highest - entity->UM_Window_Size) {
+            entity->received[i] = false;
+        }
+    }
+
+    if (entity->RX_Next_Reassembly < entity->RX_Next_Highest - entity->UM_Window_Size) {
+        for (uint16_t i = entity->RX_Next_Highest - entity->UM_Window_Size; i < entity->RX_Next_Highest; i++) {
+            if (!entity->received[i]) {
+                entity->RX_Next_Reassembly = i;
+                break;
+            }
+        }
+    }
+}

lib/rlc/rlc_rx_um_entity_c.h

@@ -0,0 +1,30 @@
+#ifndef RLC_RX_UM_ENTITY_C_H
+#define RLC_RX_UM_ENTITY_C_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define UM_WINDOW_SIZE 1024
+
+typedef struct {
+    uint16_t SN;
+} UMD_PDU;
+
+typedef struct {
+    uint16_t RX_Next_Highest;
+    uint16_t RX_Next_Reassembly;
+    uint16_t UM_Window_Size;
+    bool received[UM_WINDOW_SIZE];
+} rlc_rx_um_entity_t;
+
+void handle_um_pdu_outside_reassembly_window(rlc_rx_um_entity_t *entity, UMD_PDU *pdu);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // RLC_RX_UM_ENTITY_C_H

lib/rlc/rlc_rx_um_entity_c_wrapper.cpp

@@ -0,0 +1,6 @@
+#include "rlc_rx_um_entity_c_wrapper.h"
+
+void cpp_handle_um_pdu_outside_reassembly_window(rlc_rx_um_entity_t *entity, UMD_PDU *pdu)
+{
+    handle_um_pdu_outside_reassembly_window(entity, pdu);
+}

lib/rlc/rlc_rx_um_entity_c_wrapper.h

@@ -0,0 +1,16 @@
+#ifndef RLC_RX_UM_ENTITY_C_WRAPPER_H
+#define RLC_RX_UM_ENTITY_C_WRAPPER_H
+
+#include "rlc_rx_um_entity_c.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void cpp_handle_um_pdu_outside_reassembly_window(rlc_rx_um_entity_t *entity, UMD_PDU *pdu);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // RLC_RX_UM_ENTITY_C_WRAPPER_H